/**
 * Copyright (C) 2007 Google Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

package org.hibernate.shards.loadbalance;

import org.hibernate.shards.ShardId;

import java.util.List;
import java.util.Random;

/**
 * Random selection load balancing algorithm.
 *
 * @author Max Ross <maxr@google.com>
 */
public class RandomShardLoadBalancer extends BaseShardLoadBalancer {

  private final Random rand = new Random(System.currentTimeMillis());

  /**
   * Construct a RandomShardLoadBalancer
   * @param shardIds the ShardIds that we're balancing across
   */
  public RandomShardLoadBalancer(List<ShardId> shardIds) {
    super(shardIds);
  }

  @Override
  protected int getNextIndex() {
    // Implementation of nextInt() seems to indicate that this method is
    // threadsafe.  I sure hope I'm right about that.
    return rand.nextInt();
  }
}
